all the lights are addressed and if a fault happens like a bulb(sorry lamp) goes out then it comes up on the janitors laptop...when the lights are installed they are all given an address so that they can all be controlled separately or together as a whole room or just above somebody's desk, the lights are usually set up to slowly get brighter or dim at sunrise and sunset, this is so that you don't have all the lights coming on all of a sudden and "startling the poor office workers" also any light that stops functioning even in the back stairs or a cupboard can get changed out instead of not being mentioned to the maintenance people...
These are becoming almost compulsory in all new office and retail buildings as they can turn on all lights in the whole building when the fire alarm goes off....
you will notice if you are in any city centre around 9PM that a whole office building's lights will go out in 3 seconds flat in quick succession floor by floor.......that's a DALI set up....makes sure that all lights go off to save power when the building gets emptied at the end of the day.....and if a fire alarm goes off everything gets turned on...or somebody opens the door and keys in the Alarm keypad, they all come on in the corridors and hallways, and at reception....PIR occupancy sensors switch everything else on....and the toilet lights come on as soon as you move the door handle to open it, and go off soon after you walk out...to save power...
The staff get told - Do Not touch any lighting settings, the building will do it by itself...
